package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 公共字段自动填充公共类
 */
@Slf4j
@Component
@Aspect
public class AutoFillAspect {
    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {
        //1.获取目标方法上的注解，并拿到注解里属性值
        MethodSignature methodSignature= (MethodSignature) joinPoint.getSignature();
        Method method = methodSignature.getMethod();
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        Object[] args = joinPoint.getArgs();

        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];
        try {
        //2.判断注解中的属性值，如果是INSERT,就补充四个字段（创建时间、更新时间、创建人、更新人）
        if (operationType == OperationType.INSERT) {

            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setCreateTime.invoke(entity,LocalDateTime.now());
            setUpdateTime.invoke(entity,LocalDateTime.now());
            setCreateUser.invoke(entity, BaseContext.getCurrentId());
            setUpdateUser.invoke(entity, BaseContext.getCurrentId());
        }else if (operationType == OperationType.UPDATE) {
            //3.判断注解中的属性值，如果是UPDATE,就补充2个字段（更新时间、更新人）
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity,LocalDateTime.now());
            setUpdateUser.invoke(entity, BaseContext.getCurrentId());
        }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
